Apparatus for casting metallic ingots



Aug. 13,1940. M. AslMow ET Al.

APPARATUS FOR`CASTING METALLIC INGOTS Filed Sept. l2, 1939.

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Patented Aug. 13, 1940 UNITED STATES PATENT GFFICE APPARATUS FOR CASTINGMETALLIC INGOTS Morris Asimow and Frank E. Mooney, Gary, Ind.

Application September 12, 1939, Serial No. 294,536

1 Claim. (Cl. 22-139) This invention relates to the casting of metallicingots, and more particularly to the elimination or material reductionof splashing of the molten metal against the sides of the mold duringteeming.

It is well known to those skilled in the art that during theconventional manner of teeming molten metal into ingot molds thesplashing of the molten metal against the sides of the mold causes, tosome extent, surface defects, such as cracks, seams, etc. This isbrought about when the molten metal is first teemed, at which time itimpinges on the bottom of the mold or the mold stool (if one is used).The impinging of the molten metal naturaly directs the movement thereofonto the relatively cold side walls of the mold, causing particlesthereof to adhere, whereupon it is impossible to obtain homogeneity ofthe surface of the ingot.

It is one of the objects of the present invention to provide anapparatus for casting metallic ingots in such manner that the splashingreferred to hereinbefore will be eliminated or materially reduced tosuch an extent as to minimize the deleterious effects thereof.

Another object is the accomplishment of ends referred to immediatelyhereinbefore in an inexpensive manner.

The invention, then, comprises the features hereinafter fully describedand as particularly pointed out in the claims, the following descriptionand the annexed drawing setting forth in detail the certain illustrativeembodiment of the invention, this being indicative of but one of thenumber of ways in which the principles of the invention may be employed.

In said drawing:

Figure l is a sectional elevation of a conventional ingot mold employingthe device ofthe present invention;

Figure 2 is a plan of the mold and device of Figure l;

Figure 3 is an enlarged plan of the device of the present invention; and

Figure 4 is a side elevation of the showing of Figure 3.

Referring more particularly to the drawing, the numeral 2 designates aconventional big-end-up ingot mold of conventional design having theusual necked-in bottom portion 2, bottom opening 3 and closure or plug 4by means of which the formed ingot may be stripped from the mold.

As shown more clearly in Figure 2, the ingot mold 2 is shown as havingside walls which are corrugatedas indicated at 5, but it will beunderstood by those skilled in the art that this is a matter of designwhich, as such, forms no part of the present invention. and may or maynot be employed.

Referring particularly to Figures 3 and 4, the device of the inventioncomprises a metallic plate, generally designated at 6, which is composedof the same, or substantially the same, composition as the metal of theingot to be cast. 'This plate 6 is quite thin, so as to be readilymelted by the ltemperature of the molten metal being teemed,

whereby it will become homogeneous therewith.

As shown particularly in' Figure 4, the metallic plate 6 is providedwith side edges 1 which are directed upwardly in an oblique manner, andthe central portion of the plate is provided with a circular aperture,designated at 8.

It ls important that the central aperture 8 be larger than the diameterof the pouring stream of the molten metal as it reaches the bottom ofthe mold 2.

According to a preferred embodiment, the metallic plate 6 is constructedto occupy a position which is 3 per cent to 10 per cent of. the totalheight of the mold above the bottom thereof; but in all events it willoccupy a horizontal position in said mold. In addition, the metallicplate 6 is so shaped as to lit in its predetermined position in suchmanner as to reasonably resist displacement by the molten metal strikingit from either above or below.

In the present instance, the plate 6 is shown as having a dimension A ofapproximately 20% inches and a dimension B of approximately 19% inchesin order to flt a square ingot mold matrix having a cross-sectionaldimension of 20% inches. In a plate of this size it is preferred to havethe radius of the corners of the bottom portion thereof, designated atC, approximately 1% inches and a corner radius D for the upturned,portions 1 of approximately 2% inches or to conform to the radius of themold.

When using a plate 6 of the specific dimensions referred to, we preferto place the same in the mold 2 at a point approximately 4 inches aboveits bottom and below the ends of the vertical corrugations 4, if suchare employed. When of the dimensions referred to hereinbefore and as sodisposed (about 4 inches above the bottom of the mold) we prefer thatthe central aperture 8 have a diameter E of approximately 14 inches.

When so constructed the metallic plate 6 may be lightly sprung intoposition against the walls of the mold and is thus enabled to resist thestriking action of the molten metal from either above or below, aspreviously indicated.

When the diameter E is sufficiently large, it will be obvious thatprovided, of course, careful teeming practice is observed, the stream ofmolten metal, after striking the bottom of the mold (or the stool, ifsuch is employed) will be conned entirely to the space below themetallic plate 6 and thus be prevented from impinging upwardly onto thewalls of the mold matrix.

When using a mold of the type shown employing the usual neckedin bottomportion, designated at 2, the stream of molten metal striking,r thebottom of the mold will be confined in the rounded end, which willeventually be cut 01T as scrap. Thus, no splashing will occur which willcause any surface defects on the final product.

While we have shown and described one specic embodiment of the presentinvention, it will be seen that we do not Wish to be limited exactlythereto, since various modifications may be made without departing fromthe scope of the invention, as defined by the following claim.

We claim:

In combination with an ingot mold. a horizontal metallic plate disposedadjacent the bottom of the mold, said metallic plate having an apertureof substantial size to accommodate the teemed stream of molten metal,the side edges of said plate being bent at an angle to enable the plateto snugly grip the mold Walls, said plate being composed of a metalwhich is substantially the same as the metal of the ingot being cast.

MORRIS ASIMOW. FRANK E. MOONEY.

